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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a683d64a8de7c033213648fbf272086f1f2e0dc368768896b8ad6c5d15f9e2e7' 
  AND token = 'I3E6aCA6Q9ULyL4OOuNGwJp8LwXEm9400MGX8SftpSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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