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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150aa88fac849bab9613c1388de94bb9e9e6238671e7cbf8f4f6127f8ce31807' 
  AND token = '3PEYYG73MOTwDXQgnb1fKkY5b3qtX/t4EY+24YYjJwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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