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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5482f7fe0251e06809056488985b730320c8871d903eb826cf4a69083b0f3ab9' 
  AND token = 'Wy1G9EeDpeiyPWZp3CFddC/t7rzEraJWPiFsxFUqqVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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