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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2daf2433664cb679544c3f402a27644a1160ec9fc706122a4cb56a753a4191b' 
  AND token = 'Ktx5CHJGkPwHkkAnoiqJTsomm9gR4/uzoLgNavMmA38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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