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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93454d2fa6bdb68dc27f8de8d7ae007ae7f85b4db7c2ad655b516e72170eb87' 
  AND token = 'DipSRzK13Se2oU3sgmmmg+OivBkD8Og8e00yWcDhrEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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