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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba8a6b5da5f448469e9d91a2619ca94062782afea2faa4d059ab2e22e661241' 
  AND token = 'iNhFqkVpsU2P3FQuAuOO04NRVpIy5Ro8bQqia3GXPWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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