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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebcb75135ce5529b5ef1d6b9dc52b940da2744ee03052d495e276c738e4add5' 
  AND token = 'cJ+GmnycBQMKECBD8dguhcpG9xZ1iVGA1rUZHWbTkWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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