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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd485f309e4c893ec415f31592d3b527fd2f55f14334e02b9ceedc68f617a278' 
  AND token = 'vKHW/xuU9kVo8Aiy28f39IAprh7PFuMIvUQUsm7QYlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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