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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2a78533e0c63e5e08c2ace3d8bc34ef09de5a10ea20b689619def060a87fa8' 
  AND token = 'dbojV9ABU0M+5XAlpO6uM9sF8f3aDtER+Jouzv9ydS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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