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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94b0ed882e3a785310f24c4078221895f18d30a2103294799a7bb065b79dcb9' 
  AND token = 'mma0CSubGjpA6g43q6h7KtvxdIXJKENYEGyT5LclmRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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