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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069adf292ad6c56dd4e85d00481f3add082c14cac8ad9ec6c2e76bb94876215f' 
  AND token = '8l84Ax80UYTX3RNtYzTUNbny1emWMU4HqihnOq5ICMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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