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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619c6e32cd4185ea660797700b972375231cf9b260badbb389d8c4d933be4d42' 
  AND token = 'GTZvoua5JRHzOKSBJtL/xEkTdb1QvtQ6v1/0BcC1qNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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