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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c91b79f5f6647e4c34908b09375270b0a78ed57c2e91d84b7ab56fe92009c7' 
  AND token = '6KO9sPv3TnHI6UUfIO5u55QenUi9g25kMbTE4C3gk58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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