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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63af1acfdf745155560cec88c5941b3b524e2a58b02fecf8281ac264544cad1' 
  AND token = 'KoszTt6gXI2sbtDEwJNnU9k2R2lBdIjKrwyBX0APGwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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