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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e4540d87a097b7386be40d3c8355ab28f8104c23bee49cf0e981dcfeff911e' 
  AND token = 'eArFjczB13BvLMNec6wDxh1s0FiNyYD5dNEjsB8Zd7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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