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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3bdf61aacf18cca32117479fa6ca20776102237733021a61e8123a84fbc858' 
  AND token = 'EhqIansErzQHxAvqjBFQjV+3B+McaRSrwdRzJ0jDvLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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