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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843dab0619bf3d6b242aeaf5928cb6864a7573673398b6d8cf8fbe3ff1f528f0' 
  AND token = '0GFGy0ggpfQIOK1D6KR6UYVHq5QJgNYaDDnAClD61p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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