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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caeca418841033a3bc45b780c82e848f876b79fa124ce15dcf5fad1b78d9ca7e' 
  AND token = 'hYCoSvyddBFkck8LRBDhSIW17r6OTBS6EugQOsOraQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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