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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296925db978bd1b214020a3e90f1eda94d021ac9be4ebcd5a6fa9910a4f0d2e7' 
  AND token = 'J7UMj6ahIYcfqAAM0MwfAG3/a1VW190PwUCZ7AttDBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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