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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd618914bdaf915eeaf4bcb0c073892181dc2da7ed499616929ea3a28e18e3ff0' 
  AND token = 'XURqZUZQCnTvqpB0o7OfF3gy1gWqHbGdzHQr2N/CLrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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