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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a843e43853b460d4bd3d29c4771d7ed17e64d4acb640ad0334f4d3995cfd952' 
  AND token = 'OyyFEkrVETXZqYFWwlGuCFfJ5FE6PU6xbMMheEc8/h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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