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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5a9602a9fafc7ead2edd9a3bca3b2ca30d9339d0e3251a96b7926eee91e7b0' 
  AND token = '+0rXkIp1JYMrkYbAgOrn9+Mu+NgpshHPPmsatCynKcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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