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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ce92e9806d8a7dff88c69f4e2d9e4f283cf3e406336835fc6496afcbfdb1de' 
  AND token = 'JzJ9NzuqJyzV/u+NJ8FuLH9TGGIj80ZVZISQ2Tgk0PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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