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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69c4008d3deeba67196de8cdfe87d0438a4eeb9011e22c32ec2987b8717e60f' 
  AND token = '5jFmhapJlX6ijvHrwf4Sgmrp01QCij9XD9FA8ceR9gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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