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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff32d4e966ffad5472b4539659cea223ce310dd11a6e681d6badfbf4a43f455' 
  AND token = 'Vcx8lMMVXCQFOzzWCw7HLyiWWB5aXJs29+X/1INAbpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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