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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25512b5700e0be6891ec7d3459a9888b7dd2e34ab575643b792be2560097cac8' 
  AND token = '4wBqkfomGLyokNqI4kmbtPL7tIAsqBIHPcwwSK/x4dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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