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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0addd148ed44de895ee08bcd89d2c21e4782c3b91578443977ac028645061e8' 
  AND token = 'YM7jwB5lz8/K0jp3jSX8srATEGpNjvhYG8faafhZM4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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