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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc59f9c07fc4de894253a86a316aa767758c265d9fa2379e58e4b818568d3bf' 
  AND token = 'kjv8l56/ABvyn1hzGO7N28MJEpFRLim8fSn/9YI5uNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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