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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f486d36415c7b5cb3890a3143726b80eb3b6b9c182f981f37665ecef22ba7d' 
  AND token = 'BnWW2oXVX9J7r6YvUaFjc8TbK656KfxJSxuLjDnaVR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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