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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8458bd251f62d304ea414f55e4ab9ce37db218c748c8aec56f08b2f10bb6c54' 
  AND token = 'qazwbyfjLGi7NoZwn7qIupFIrBllaTmvNDIfUKEtbk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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