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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb739b1b8f8f2ae6249f36c0ef88a14b477b595351c85fd3e428400f81d53b3' 
  AND token = 'ue4k2ER5JCLGmhXYfJXk9iu94eEedmc8Yfk+bBmQBog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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