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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297bc30056f55b3b5789e8bd14bfd00e4128b15de417148ffcbf19dab88733eb' 
  AND token = 'fVa1dwCLNWGpApWknvKIyqgi0ucPh/isiOt10KfWCAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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