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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208ecfbd4e6ce188115f4af1507f368fc09da2ee8a3e13dcde4b411aa5eb30a4' 
  AND token = 'BB/zcNw4nlLScf7OeeIZ76XIh/J2Y+TF9XnS458k0UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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