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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024410ea5ad4111d96a489fff29a69655e9b573769c9adeaa35aac8f0601d764' 
  AND token = 'ygmeBE2jyJLHe/+PL35K69Gu1OJB7JyfXgg4xF38r88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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