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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c911cb53d8d85c5dbca039e93a526599cdfb78dfc8cd8646d6e2ddec95bb6f' 
  AND token = '1NDqBHXOmomix6595OP6nLw6AIU7OruaMHx7GXYrPxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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