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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d77af5924a04db37429dc274a74bd9a5af9a5e3da865dbf74c65e1f321c7ba' 
  AND token = 'pCQWfqtip0hnO8krFceThvpbrj+Huv/8GQ/5JHYi9uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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