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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d919f76fea2f59efb9e6f25a947f93de5392e8413b9f86c73d993c66505ceb' 
  AND token = '9fa+I7gvSWkObkiUs2EQoZtUt/Ny5mVfev4ZaWHyAck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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