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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8eb32ed8351729a7eea7d53febd7d5d57c90dbeec636bb61f8954249ac3681' 
  AND token = '0PDdTszKKkuLJnCAHwPX0HLVtLqQtQA/2mzXwi63xtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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