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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8db577bb5736087b65182ddf7d69c580a5d4d6fa7dabcf3d9da5e1b40940f3' 
  AND token = '/9LJQi5jjkDvAW0eudYgwZA83PnMaG04YrC17JI6xwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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