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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e76bbf1f27f3f1dd0a9c2c820908bb3d473920ff15e0c3bfd69d49eabf8e1de' 
  AND token = 'mhhcJe9BlUlHOvIeJ2/U1Ma7CLNcePkWZ1aLtfgYRnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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