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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef267b15bfd7d51e1ca22e468fdc6e4a6b1852b1e501c08f882a9e52ea44b0c' 
  AND token = 'ejeiFVPccvOuHrlw4yuL4yHdd6HZ5jZmxkX9b9CmzCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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