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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63dbdb73478b91492ef8d0d8ad87f841bc4260cf78e826b6dd45db890676d680' 
  AND token = 'c5ogAFut4GrauGzR5KZEfDB1s9cQ4T2lkZRxh9NSS1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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