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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a561727dc75c76e9e884214e5e0e4c8904343e6529e2584ca58286fc1d66665b' 
  AND token = 'jU56J77Vf7TrsOM9EwK128pLqU6VWmjymIljop16i8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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