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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929b5d0b72a407b970bd25529e94aba446b26ebc928b5960f1c591ad80616fbe' 
  AND token = '7XUA5SjI7JN5Yq/cgCj0WyWtdZWRHKnfmHqYRWikJ3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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