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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408ca1e366a41e3c4040ee5f70eb8ce4a33a49ca0fbe25172ca887b094102d4e' 
  AND token = 'ub2ew8eDjfrnLrxxFr5LOD5Xt1siXw2pv0nb/G0POdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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