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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a65e82562b4c26ef7d1777b8ecc4a6a9ab39ad64ff9f97d96efaca90f0b4ff4f' 
  AND token = '5Fcw8BUVVBO6PjSM5nWgt6ckivrb20DEE5MxXHJIqF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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