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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86944799a3dba5aed84dc4d6a7a6a808d97801181eab37365301c17fe685c778' 
  AND token = 'T+Y0G+eGkHFgEQUHcOMsnR/qHtHjRjwRG+H/1Gj3WiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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