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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9378abc9ae193bd3671693ae9996c400fe20dc030382f85c247f15629f8d9f' 
  AND token = '35f4K0MM5KdV+ZLlv+kWxKQv55r6XVW/ffb+7jwqTaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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