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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74c75ba655912839b6673285ed461192b39878b9503677bbd297a9489f7a05f' 
  AND token = 'bQM2lYM17MNWOGqIKkcOzshPjnYlmyIn/Y1SxDMSO6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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