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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f1ea2d4d43fa41b2e61191764422eabecfb5d7db26d7ac0e81c927703693d8' 
  AND token = '/KEAMGQTBTt9gmbS3Te66ppov1LoGBxMwKXgPId0cms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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