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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4eb6cd9c9f42556142d6a8584473aeba581068b16661e464bf3effb135a2e9' 
  AND token = '8AL8eqvjSgHjhAarbiyJ0Xq9CIomgNfjLJyJzu3PYXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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