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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503c6afe66a03356bc17d4ce879a0a13b4b4c04f9fe5a06bae51676467fb89b0' 
  AND token = 'ZI1r66oyUgvNYmV6VY0j6UXt6F440D+9mQtZt68YlIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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