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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac8907e15a7e4ce9e4b798bc1b7ad65f9401afe7708c05e02745a15f6c87ea3' 
  AND token = 'XAuu2+CQsW3/W9uauM711zZAi0SEwXEdSvM67F3nIgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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