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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935c821983354c17d9bb5225b6349c28885661bb7829169cf7dd5fd50cd45dc3' 
  AND token = 'UErzRKT7gsWMUc8BhUBqcJiF9V0CcwF32V7jIUBWZcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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