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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcef5f235ca1d73bae75cf27e31eb10c81847b68316ef4de75e8d1e67d932678' 
  AND token = 'PF+ACID8ojBk6yFwdAjJsuS/7dqQdAlOMCn6Owc52Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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