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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf3c17b787feb8a9ebbee2cf63615074783f9163b2c0f040d5df7c28ba5837a' 
  AND token = 'luqO+1B6ZhBGbCdXW423msntbSslRxnDQ6uA9+P+ubo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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