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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb4e15bcb7c2dbd8020e92e21e8e1944479f4253e3abd6edb5dacb80722e49e' 
  AND token = '2IWrsv9jw+C9vYp+hJEBdyiB9bvQv5889QTYQAbLX/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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