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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331fe87fac726d469c13377b68f739b3847b99f96b03b7195a00640bdc3322ad' 
  AND token = 'ITXZwXrpc/VZiSiI7DffOi8Ht5PVXw8o4/JOqfBDOvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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