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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad15358b8b81e6b920d86403a694715fc4d03a199b62631e68fe6daae47413e' 
  AND token = '4RmfpiLL3cx7CSQhsWEpGJJ+Qj6865teUUX+Xn+bWJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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