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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0d72e47d6f59ef46f2e4396f7c7ace60733002aedf1f15c12ed3d9d7e911a4' 
  AND token = '6LtZllmeJMRvx/CucNIPt0r9Cp5UMDIlQvo1iwVpnnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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