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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66e0fbb77f1309935a54ccda2ca345200df2dd8f8fb6364492a1b5cf92e7d40' 
  AND token = '5Bk5dfxHzQsrXWQMH7s9AFhNjyXJzmd0nkjoSy2X/50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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