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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36bb47071f8b0f64f793e35ba4ba17112707d16618d13c0b29f51d4ae123d60' 
  AND token = 'CbXbAirHki5K3B4m1MBt6rb46c7kvUfUfAlqKFMHd9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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