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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1898a0a92857121f68776c1d76220fb47f647111080312847420da1087d038d' 
  AND token = 'B+rOQgycC3pM9Kyy9CXtlpk+66UvIZqZkbt7/Pl1uK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}