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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32679febd89e54e02fd82e279e2d714bf32dec2204f4d3aa9fcaa673c6fe84b7' 
  AND token = 'sTCgaYeHu4sWew3BpvAkg2hiZ6hTnWv0DWj02NJDa20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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