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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d177646a23b631bdef89639c70f24fa09aa2b77823a6bb4ab703aeea6119173' 
  AND token = 'hw5YN3b7FFJ776OlCt5hW8BhItSKrBwRUCzVBj5hrus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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