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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49798759f3421b5623d64f00f79ea28d97ab9a58cfad0cc44cfd4b53e367fac9' 
  AND token = 'hT4XECd15IP8+cirzsW2ioD6CXGa7gVr6c4lQgjnDTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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