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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0abaff70d5e99c564adac724299e6c848d7a9dcbe1f9b08bfc651f19fe2b8a2a' 
  AND token = 'D7Fm+T2IwCUa8NVg5RrYu0btgQaMQEkXoefQUZPv/5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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