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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b592c9ba8c458cf93ef1f752b0bc4ee7cae5452b88c7a2d8c833c8ae5c001c0' 
  AND token = 'B2dPC+YWN1rayngZkEQmN356Qlh/jv8VlPd2AuWSlSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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