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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c45cd3d9a22622670a8e82b76f4bd616511c9ab8044f4126384b28a4e4fa36' 
  AND token = 'TNJ/6YZPl3JMDCQn6lMXKRoYoBlp2zlXYSb3amSHvoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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