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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfc17d97c81a805e6055c3e476f50d5601ebfa05e8359bd567c6f4b36b0a141' 
  AND token = 'x2co2upnb2sQX2FatM9n+Sn21fj7FRtZXwWzCbUSg5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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