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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d598082fe858e684cb4ccc2858c214a580dd188a3f5b7b4ed4c7ea096c4170a' 
  AND token = 'w635GW/fguMbGyHZYjlo0uf4QwFjC85tPBpOLZhvNHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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