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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62592f4ceb252cdc4868b3daf3b5c57f001588a71a9031266177f3d519f7c5a8' 
  AND token = 'LQ6AdUEPt6/M/eLmniCrsSH3g13V2+DShfusTZOkcDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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