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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74ce643469a966c05cb30b43c2c36f7da2c2e5361d1fb2eebf5e9147af7d1e6' 
  AND token = '61yVioM12/WEnzaMIiVmcJT0puHGBu45hoC/n2fKkyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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