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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '166edb9be07ccc327d892c888c0ac8bc3fe4679696c5f2de107baccd42a0ce32' 
  AND token = 'K/PtNviYUjPkpn/Jxh5TV6+lUc+D7xJ9GG3/dpMz8hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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