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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40d4a3380a43ec5a256fe7636b98bc3bd61a1f37195eefdb29c2a2630b92ae3' 
  AND token = 'dl590KAkkcbs6xk2/sRU+E/s2Pp8Ucvu9P9M1TUqGq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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