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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6c4458d8eba97ac52f2b808bd390e5b7e7c101cbfaac670e4b178f27a73dfb' 
  AND token = 'Uee51LB01SQT+Jo2SO0a8E7Hezc3efW9H6qhMZOTINg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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