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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12c9431cae84ccbeb160afbb1c19c0ee4b0b51c05531fe580ef1e2fdbd8c95a' 
  AND token = '4mQf4ITR90xZwHV27MocoYD0Y0nRnahwuoNOwitMook=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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