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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c33fae8a15b3ffdce2dfb992855ccb0e4ce11a4a103f3d43a1dc25ba611720e' 
  AND token = '0K8VPmQ0lUuxi16pfIJrm0TnTbeCdXf9X3l93I+yKPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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