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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432f0bd67b63829341b1a2dc83ea67b12c7e375ae4dba2c5b4632199b6b91c5d' 
  AND token = 'EPv+OiAlwFgB5iKZCcIYpYaS0VsjEFE16PSK48T53K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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