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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209de462c4eb54c6c777cf0b3d99e3ecc73644786dcd2bfcc8476d4b3bbc4ff3' 
  AND token = 'YKXWMuLkWC1zrgTxOqKHzTD4kVjqTeDbM6wuAOmWPig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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